Abstract
In the application of Structural Health Monitoring (SHM) methods and related technologies, the transducer used for electroacoustic conversion has gradually become a key component of SHM systems because of its unique function of transmitting structural safety information. By comparing and analyzing the health and safety of large-scale structures, the related theories and methods of Structural Health Monitoring (SHM) based on ultrasonic guided waves are studied. The key technologies and research status of the interdigital guided wave transducer arrays which used for structural damage detection are introduced. The application fields of interdigital transducers are summarized. The key technical and scientific problems solved by IDT for Structural Damage Monitoring (SHM) are presented. Finally, the development of IDT technology and this research project are summarised.
Highlights
The construction of important facilities in key engineering areas is directly related to people’s livelihoods and is the lifeblood of the national economy
Compared with piezoelectric ceramic transducers (PZT), Polyvinylidene fluoride film (PVDF) is more suitable for dynamic modal testing, which is flexible and easy to integrate; it cannot generate a large driving force due to its low elastic modulus when used for actuators [40]
Monkhouse et al [41] designed a PVDF film with copper backing to improve the response characteristics of PVDF film and produce an interdigital electrode pattern using printed circuit board (PCB) technology; simulation defects are detected by modal selectivity
Summary
The construction of important facilities in key engineering areas (such as transportation engineering, aerospace engineering, and civil engineering) is directly related to people’s livelihoods and is the lifeblood of the national economy. How to apply it to engineering practice is still a problem in view of the health and safety of large structures, the related theories and methods of Structural Health Monitoring (SHM) based on ultrasonic guided waves are studied and applied to the fields of vehicles, ships, aerospace structures, bridges, pipelines, and offshore platforms. The new flexible transducer array (with high electrical energy density, broadband, and omnidirectional excitation and reception) has been developed for large composite panel structure health assessment technology, so as to enhance its electrical coupling performance and achieve a wide range of exploration performance. This represents a further improvement of the existing SHM method. It will provide new sensor technology support for future smart materials and structures in aerospace and other large structural NDT applications, as well as promoting the application of new material devices and related technological developments
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